A 3J Collet is a heavy-duty workholding collet used in automatic lathes, capstan lathes, turret lathes, and SPM machines. It delivers strong gripping force, durable construction, and reliable performance for medium-diameter, repetitive production jobs, making it well suited for Indian machine shop applications requiring consistent and rugged holding.
A 3J Collet is a heavy-duty Workholding collet commonly used in automatic lathes, capstan lathes, turret lathes, and SPM machines.
It is designed for strong gripping force, durability, and reliable performance in medium-diameter, repetitive production jobs.
3J collets are widely used in Indian machine shops where robust construction and consistent holding are required.
Key Features
• Strong and uniform gripping force
• Suitable for continuous mass production
• Simple, rugged design
• Long service life
• Easy installation and replacement
• Available in round, hex, square & step types
3J Collet – Exact Dimension Details
|
Parameter |
Typical Value / Range |
|
Collet Type |
3J Collet |
|
Outer Diameter (OD) |
30 – 55 mm |
|
Overall Length (L) |
50 – 90 mm |
|
Clamping Range |
4 – 32 mm |
|
Nose Angle |
30° |
|
Grip Type |
External gripping |
|
Accuracy (TIR) |
≤ 0.01 mm |
Exact OD, length, and bore are manufactured as per machine spindle and job requirement.
Construction Details
• Material: Spring Steel
• Heat Treatment: Hardened & tempered
• Hardness: 58 HRC
• Slots: Precision slit pattern for uniform grip
• Finish: Bore ground / semi-ground as required
Types of 3J Collets
• Round 3J Collet
• Hex 3J Collet
• Square 3J Collet
• Step 3J Collet
• Special profile 3J Collet
Applications
• Automatic lathes
• Capstan & turret lathes
• SPM machines
• Fasteners, shafts, bushes
• Brass, MS & aluminum components
Supply Options
• Standard & custom sizes
• Hardened or soft (machinable)
• Made as per drawing or sample
• Suitable for manual & semi-automatic machines
• Export-quality packing available
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